同期脱冰架空输电导线的动张力特性实验研究

架空输电导线脱冰后,架空导线发生大幅度的非线性震荡,其震荡的位移和导线张力严重威胁架空线路的安全运行。基于档距为40 m的架空导线模型,通过模拟实验的方法对同期脱冰后的架空导线脱冰动张力特性进行研究。实验结果表明:导线最大动张力和最小动张力发生在脱冰震荡的前1—2周期内;同期整档脱冰时,导线动张力变化幅度随覆冰厚度增加而增大,但始终低于相同条件下的静张力的数值;同期局部脱冰的最大动张力随脱冰位置的不同而变化,当架空导线档距中央局部脱冰时,将会引起更大的动张力变化,其最大动张力数值会出现大于相同覆冰条件下的导线静张力情况。

Experimental Study on the Dynamic Tension Characteristics of the Overhead Transmission Conductor under Synchronous Ice Shedding

Following the ice shedding, the nonlinear oscillation of overhead conductors with large amplitude will occur, The oscillating displacement and tension of the conductors will threaten the safe operation of the overhead transmission lines severely. Based on the overhead transmission conductor model which has a span of 40m, overhead conductor’s dynamic tension characteristics after synchronous ice shedding are studied though simulation experiment. The results show that: the maximum dynamic tension and minimum dynamic tension of the conductor always occur in 1-2 oscillation cycle. For the whole span ice shedding, the maximum dynamic tension increases with the increase of the ice thickness, and its value is always lower than the static tension under the same icing condition. For the partial span synchronous ice shedding, the maximum dynamic tension changes with the locations of ice shedding on the overhead conductor, the central partial span ice shedding may cause greater dynamic tension in the conductor, and its maximum dynamic tension value may be greater than the static tension under the same icing conditions.